Microprogram-control unit for data processor

Details Microprogram-control unit for data processor Microprogram-control unit for data processor

1977-10-06

1979-07-03

Nusbaum, Mark E.

Boots, shoes, and leggings

G06F 916, G06F 920

Patent

active

041602897

ABSTRACT:
Macroinstructions stored in a program memory MP of a data processor, read out succesively under the control of a program counter PC, are decoded in a control unit CN which establishes a macroroutine for the transfer and processing of data within the processor as well as between the latter and associated peripheral units. The control unit comprises a microinstruction memory MM addressed by a microinstruction counter CC which is supplied with a starting address from an address store MI at the beginning of any microroutine as determined by a decoding of the final microinstruction of the immediately preceding microroutine. The address store contains 16 groups of 8 cells each; a logic network RL.sub.1, responsive to various bit combinations from a primary decoder DC.sub.1 and a secondary decoder DC.sub.2 in an output circuit of microinstruction memory MM, selects one of the cells of a group activated by a multiplexer MT.sub.2 whose operation depends on the presence or absence of a changeover command JM generated by the final microinstruction in the output of the primary decoder DC.sub.1. The secondary decoder DC.sub.2, activated by the changeover command JM, lies in the output of a preferential coder establishing certain priorities in the selection of the new starting address.

REFERENCES:
patent: 3593313 (1971-07-01), Tomaszewski et al.
patent: 3930236 (1975-12-01), Ferguson et al.
patent: 3972024 (1976-07-01), Schroeder et al.
patent: 3990054 (1976-11-01), Perlowski
patent: 4005391 (1977-01-01), MacPherson
patent: 4038533 (1977-07-01), Dummermuth et al.
patent: 4047247 (1977-09-01), Stanley et al.
patent: 4050058 (1977-09-01), Garlic
patent: 4064554 (1977-12-01), Tubbs

Affiliated with

Also associated with

Rating

Microprogram-control unit for data processor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Microprogram-control unit for data processor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microprogram-control unit for data processor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2277563